In recent years, the market penetration of LED lighting has increased year by year, and it has quickly replaced traditional lighting with high energy consumption and short life. What is the most important factor affecting LED lighting to quickly replace traditional lighting? Yes, it is the price! It is the price! Still the price! The YL712X series of chips introduced by Yanglin Electronics help customers reduce the cost of LED power supply with few external components and ultra-low cost.
The typical application schematic of the YL712X series chip is as follows:
We can see that the YL712X application has few external components, and it can achieve high efficiency and high precision constant current drive with only 8 external components. It is especially suitable for bulb/filament lamp applications with a full range of input voltages up to 9V from 85Vac to 265Vac. Minimal circuit (BOM cost around $1) and extremely small power supply size (easy to fit in E27 lamp holder) make it the best alternative to RC, with higher current accuracy, higher reliability, and consistent batch Better, especially suitable for mass production.
In order to balance the cost and appearance of the bulb, the power supply compartment of the bulb is getting smaller and smaller. The narrow power supply box space is not conducive to heat dissipation, which will result in high temperature inside the chamber, which will affect the reliability and life of the power supply. In response to this problem, the YL712X series chip integrates the lower Rdson power MOSFET of the same type of IC on the market, and in order to avoid the phenomenon of high temperature flashing, the IC also has the function of overheating and lowering the LED current, effectively protecting the power supply and increasing the reliability of the power supply.
In addition to the TO-92 and SOT-23-3 packages for low-power applications, the YL712X family of chips offers the unique SOT223 package ICs for larger power applications: YL7124 and YL7125. They are especially suitable for ceiling lamps, T tubes and bulbs up to 20W.
The following are the features of the YL712X series IC:
Buck structure
2. Wide voltage input
3. Working in quasi-resonant critical conduction mode
4. Internal integrated 500V power tube
5. ±5% LED output current accuracy
6. Start current and small operating current
7. Up to 95% efficiency
8. High voltage start, no auxiliary winding is needed to power the chip
9. Easy to pass EMC
10. Provide comprehensive protection
Cycle-by-cycle current limit function
LED short circuit protection
Internal high temperature protection function, high temperature drop current does not flash
VCC undervoltage protection
11. Package:
YL7121, YL7122: SOT-23-3
YL7121T, YL7122T, YL7123T: TO-92
YL7124, YL7125: SOT223
In order to meet the needs of different lamp output power, YL712X series includes YL7121, YL7122, YL7121T, YL7122T, YL7123T, YL7124, YL7125. The following is a quick selection table for the YL712X series:
LED street lamp refers to the street lamp made with LED light source, which has the unique advantages of high efficiency, safety, energy saving, environmental protection, long life, fast response speed, high color rendering index, and is of great significance to urban lighting energy saving.
Led Road Light,Led Off Road Lights,Led Roadway Lighting,Cob Led Road Light
Yangzhou Heli Photoelectric Co., Ltd. , https://www.heli-eee.com